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Adaptation (a dap tay´ shun)

evolutionary biology, a particular structure, physiological process, or behavior that makes an organism better able to survive and reproduce. Also, the evolutionary process that leads to the development or persistence of such a trait.

karyote in the Domain Bacteria. The chromosomes of bacteria are not contained in nuclear envelopes.

Comparative method

approach to studying evolution and ecology in which hypotheses are tested by measuring the distribution of states among a large number of species.

Domain

largest unit in the current taxonomic nomenclature. Members of the three domains (Bacteria, Archaea, and Eukarya) are believed to have been evolving independently of each other for at least a billion years.

anisms whose genetic material is not contained within a nucleus: the bacteria and archaea. Considered an earlier stage in the evolution of life than the eukaryotes.

Species (spee´ shees) [L. specie: kind]

basic lower unit of classification, consisting of a population or series of populations of closely related and similar organisms. The more narrowly defined "biological species" consists of individuals capable of interbreeding freely with each other but not with members of other species.